update markdown.js
Merge pull request #102 from teambition/master

update markdown.js
correct the path used in `main` attribute in bower.json
Merge pull request #103 from 1989car/master

correct the path used in `main` attribute in bower.json
Update readme.md
update for line break
fix for firefox
Merge pull request #105 from teambition/master

fix for firefox
fix for placeholder
Merge pull request #106 from teambition/master

fix for placeholder
Merge branch 'gh-pages' of github.com:sofish/pen